ASPxCardView.CardInserting Event
Enables you to cancel adding a new card.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v22.2.dll
NuGet Package: DevExpress.Web
Declaration
Event Data
The CardInserting event's data class is ASPxDataInsertingEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Cancel | Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs. |
| NewValues | Gets a dictionary that contains the new field name/value pairs for the row to be inserted. |
Remarks
The CardInserting event occurs when an end-user tries to save the newly created card by clicking the Update command. To cancel the insert operation, set the event parameter’s Cancel property to true.
To create a new card, click the New command or call the ASPxCardView.AddNewCard method.
After a new card has been added to the ASPxCardView, the ASPxCardView.CardInserted event is raised.
Example
The example illustrates how to delete selected cards of the ASPxCardView bound with an in-memory DataSource.
<head runat="server">
<script type="text/javascript">
function OnClickButtonDel(s, e) {
card.PerformCallback('Delete');
}
</script>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<dx:ASPxCardView ID="ASPxCardView1" KeyFieldName="ID" AutoGenerateColumns="False" runat="server" OnCellEditorInitialize="ASPxCardView1_CellEditorInitialize" OnCardInserting="ASPxCardView1_CardInserting" OnCardUpdating="ASPxCardView1_CardUpdating" ClientInstanceName="card" OnCustomCallback="ASPxCardView1_CustomCallback" OnDataBinding="ASPxCardView1_DataBinding">
<Columns>
<dx:CardViewTextColumn FieldName="ID" VisibleIndex="0">
</dx:CardViewTextColumn>
<dx:CardViewTextColumn FieldName="Data" VisibleIndex="1">
</dx:CardViewTextColumn>
</Columns>
<CardLayoutProperties>
<Items>
<dx:CardViewCommandLayoutItem HorizontalAlign="Right" ShowSelectCheckbox="True">
</dx:CardViewCommandLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName ="ID" >
</dx:CardViewColumnLayoutItem>
<dx:CardViewColumnLayoutItem ColumnName="Data" >
</dx:CardViewColumnLayoutItem>
<dx:EditModeCommandLayoutItem HorizontalAlign="Right">
</dx:EditModeCommandLayoutItem>
</Items>
</CardLayoutProperties>
</dx:ASPxCardView>
<dx:ASPxButton ID="ASPxButton1" runat="server" ClientInstanceName="btn1" AutoPostBack="false" Text="Delete">
<ClientSideEvents Click="OnClickButtonDel"/>
</dx:ASPxButton>
</div>
</form>
</body>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DevExpress.Web;
public partial class _Default : System.Web.UI.Page
{
DataTable table = null;
protected void Page_Init(object sender, EventArgs e) {
if (!IsPostBack && !IsCallback)
{
table = new DataTable();
table.Columns.Add("ID", typeof(int));
table.Columns.Add("Data", typeof(string));
table.PrimaryKey = new DataColumn[] { table.Columns["ID"] };
for (int i = 0; i < 10; i++)
{
table.Rows.Add(new object[] { i, "row " + i.ToString() });
}
Session["table"] = table;
}
else
table = (DataTable)Session["table"];
}
protected void Page_Load(object sender, EventArgs e) {
if (!IsCallback && !IsPostBack) ASPxCardView1.DataBind();
}
protected void ASPxCardView1_CellEditorInitialize(object sender, DevExpress.Web.ASPxCardViewEditorEventArgs e) {
ASPxCardView grid2 = (ASPxCardView)sender;
if (e.Column.FieldName == "ID")
{
ASPxTextBox textBox = (ASPxTextBox)e.Editor;
textBox.ClientEnabled = false;
if (grid2.IsNewCardEditing)
{
table = (DataTable)Session["table"];
textBox.Text = GetNewId().ToString();
}
}
}
protected void ASPxCardView1_CardInserting(object sender, DevExpress.Web.Data.ASPxDataInsertingEventArgs e) {
table = (DataTable)Session["table"];
ASPxCardView cv = (ASPxCardView)sender;
DataRow row = table.NewRow();
row["ID"] = e.NewValues["ID"];
row["Data"] = e.NewValues["Data"];
cv.CancelEdit();
e.Cancel = true;
table.Rows.Add(row);
}
protected void ASPxCardView1_CardUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e) {
table = (DataTable)Session["table"];
DataRow row = table.Rows.Find(e.Keys[0]);
row["Data"] = e.NewValues["Data"];
ASPxCardView1.CancelEdit();
e.Cancel = true;
}
protected void ASPxCardView1_DataBinding(object sender, EventArgs e) {
ASPxCardView1.DataSource = table;
}
#region #CustomCallbackMethod
protected void ASPxCardView1_CustomCallback(object sender, DevExpress.Web.ASPxCardViewCustomCallbackEventArgs e) {
if (e.Parameters == "Delete")
{
table = (DataTable)Session["table"];
List<Object> selectItems = ASPxCardView1.GetSelectedFieldValues("ID");
foreach (object selectItemId in selectItems)
{
table.Rows.Remove(table.Rows.Find(selectItemId));
}
ASPxCardView1.DataBind();
ASPxCardView1.Selection.UnselectAll();
}
}
#endregion #CustomCallbackMethod
private int GetNewId() {
table = (DataTable)Session["table"];
if (table.Rows.Count == 0) return 0;
int max = Convert.ToInt32(table.Rows[0]["ID"]);
for (int i = 1; i < table.Rows.Count; i++)
{
if (Convert.ToInt32(table.Rows[i]["ID"]) > max)
max = Convert.ToInt32(table.Rows[i]["ID"]);
}
return max + 1;
}
}
See Also